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monitor: Support specified vCPU registers

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Originally we have to get all the vCPU registers and parse the
specified one. To improve the performance of this usage, allow user
specified vCPU id to query registers.

Run a VM with 16 vCPU, use bcc tool to track the latency of
'hmp_info_registers':
'info registers -a' uses about 3ms;
'info registers 12' uses about 150us.

Cc: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-Id: <20220802073720.1236988-2-pizhenwei@bytedance.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
zhenwei pi 2022-08-02 15:37:20 +08:00 committed by Dr. David Alan Gilbert
parent 79dfa177ae
commit 00d60cfcbd
2 changed files with 13 additions and 5 deletions
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8
hmp-commands-info.hx
View file

@ -100,9 +100,11 @@ ERST
{
.name = "registers",
.args_type = "cpustate_all:-a",
.params = "[-a]",
.help = "show the cpu registers (-a: all - show register info for all cpus)",
.args_type = "cpustate_all:-a,vcpu:i?",
.params = "[-a|vcpu]",
.help = "show the cpu registers (-a: show register info for all cpus;"
" vcpu: specific vCPU to query; show the current CPU's registers if"
" no argument is specified)",
.cmd = hmp_info_registers,
},

10
monitor/misc.c
View file

@ -307,6 +307,7 @@ int monitor_get_cpu_index(Monitor *mon)
static void hmp_info_registers(Monitor *mon, const QDict *qdict)
{
bool all_cpus = qdict_get_try_bool(qdict, "cpustate_all", false);
int vcpu = qdict_get_try_int(qdict, "vcpu", -1);
CPUState *cs;
if (all_cpus) {
@ -315,13 +316,18 @@ static void hmp_info_registers(Monitor *mon, const QDict *qdict)
cpu_dump_state(cs, NULL, CPU_DUMP_FPU);
}
} else {
cs = mon_get_cpu(mon);
cs = vcpu >= 0 ? qemu_get_cpu(vcpu) : mon_get_cpu(mon);
if (!cs) {
monitor_printf(mon, "No CPU available\n");
if (vcpu >= 0) {
monitor_printf(mon, "CPU#%d not available\n", vcpu);
} else {
monitor_printf(mon, "No CPU available\n");
}
return;
}
monitor_printf(mon, "\nCPU#%d\n", cs->cpu_index);
cpu_dump_state(cs, NULL, CPU_DUMP_FPU);
}
}